Watch and get angry. Some of the things the video suggests are a bit of a strech, but a far greater number of good points and valid questions are made.
In my mind, the question has never been whether or not the government has lied to us about 9/11 (we pay them to lie to us), but rather what parts of those events were fabricated. The first step in getting those answers, I suppose, is to get upset at the fact that we don't have them to begin with.